Scrittura carattere per carattere

/*
  Scrive una stringa carattere per carattere
*/

import java.awt.*;

public class SlowWrite extends java.applet.Applet implements Runnable {
  Thread runner;
  Font f;
  String towrite="Questa stringa viene scritta lentamente";
  int writeto=0;

  public void start() {
    if( runner==null ) {
      runner=new Thread(this);
      runner.start();
    }
  }

  public void stop() {
    if( runner!=null ) {
      runner.stop();
      runner=null;
    }
  }

  public void run() {
    int i;

    for(writeto=0;; writeto=writeto+1) {
      writeto=writeto%towrite.length();
      repaint();
      if( towrite.charAt(writeto)!=' ' ) {
        try {
          Thread.sleep(200);
        }
        catch( InterruptedException e ) { }
      }
    }
  }

  public void paint(Graphics g) {
    f=new Font("Courier", Font.PLAIN, 18);
    int i;

    g.setFont(f);

    for(i=0; i<=writeto; i++)
      g.drawString(towrite.substring(i,i+1) , i*10, 20 );
  }

}